共查询到18条相似文献,搜索用时 109 毫秒
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Bola型表面活性剂 总被引:1,自引:0,他引:1
阐述了Bola型表面活性剂的基本性质,并介绍了国内外关于Bola型化合物的结构及其聚集行为等性能的研究进展。介绍的Bola型表面活性剂有糖配体非离子型、富勒烯结构、穴状配体、呈液晶相和能形成离子通道的Bola型化合物。 相似文献
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按照离子液体表面活性剂的种类,分别介绍了不同类型离子液体表面活性剂的合成方法。阳离子型离子液体表面活性剂可以采用直接季铵化法、复分解法和离子交换法合成;阴离子型离子液体表面活性剂是采用传统阴离子表面活性剂与离子液体在有机溶剂或水/有机溶剂中复分解反应完成的;两性离子液体表面活性剂通常采用直接季铵化法合成;双子和Bola型离子液体表面活性剂与传统双子和Bola型表面活性剂的合成方法相似;微波和超声等新的辅助合成方法将明显促进离子液体表面活性剂的合成。 相似文献
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Bola-type quaternary ammonium salt can bridge with two fatty acid soaps through electrostatic attraction to form a pseudogemini surfactant, which enhances the solution viscosity. In this work, the effects of the building blocks (spacer and hydrophobic chain) of a pseudogemini surfactant on the Krafft temperature, critical micelle concentration, and rheological properties were investigated. The results revealed that the addition of bola-type salt obviously decreased the Krafft temperature of sodium stearate (C18ONa), and a bola-type salt bearing a large benzene ring (Bola2be) was more effective than the one bearing an ethyl group (Bola2et) or a hydroxyethyl group (Bola2hy). When bola-type salt is mixed with fatty acid soap at a fixed molar ratio of 1:2, a pseudogemini surfactant forms in situ, and the viscosity of the solution is significantly enhanced by the formation of a worm-like micelle (WLM) network. The stronger the hydrophobicity of the bola-type salt or the tail of the fatty acid soap, the lower the critical overlapping and micelle concentrations, and the stronger is the ability to enhance viscosity. However, pseudogemini surfactants that use sodium stearate as a monomer show similar self-assembly abilities to those using sodium oleate as a monomer. In addition, the WLM formed by pseudogemini surfactants composed of Bola2be and sodium stearate or sodium oleate were liable to branch at high concentrations. 相似文献
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综述了松香基功能性表面活性剂的合成和应用研究进展;根据功能性表面活性剂的功能性特征,系统概括了可分解型、可反应型、螯合型、Bola型以及双子型5类松香基功能性表面活性剂的研究状况;并根据合成反应原理和分子结构,从合成方法、反应难易程度、收率、表面活性等方面详细分析归纳了松香基功能性表面活性剂的合成研究现状;根据松香基功能性表面活性剂优异的生物降解、金属螯合、反应活性等功能性性能,总结了其在生物医药、电子信息、功能材料等方面的应用进展;最后对松香基功能性表面活性剂的合成及应用研究趋势进行了展望,指出在合成类型、微观形态等基础研究和功能性性能开发利用领域的研究空白和发展潜力。 相似文献
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哌嗪系列双子表面活性剂的合成 总被引:5,自引:1,他引:4
为了探索哌嗪类双子表面活性剂在三次采油(EOR)、新材料制备及生物技术领域中的应用,合成了两个以哌嗪为基的双子表面活性剂Ⅰ和Ⅴ,一个含有两种阴离子的Bola型表面活性剂Ⅱ和一个大环表面活性剂Ⅲ。表面张力测定结果显示,Ⅰ的临界胶束浓度(CMC)为6.47×10-4mol/L,优于传统的表面活性剂;Ⅴ的CMC为1.17×10-3mol/L,说明连接基团长度一定时,增加疏水链的数目,表面活性降低。Ⅱ和Ⅲ水溶性较好,可应用于生物技术领域或在新材料中作为模板剂。MM2能量最小法计算结果显示,在有限长连接基团中引入较多疏水链的化合物不易合成。用溶剂可接触面积说明了Ⅲ水溶性较好的原因。 相似文献
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粘弹性表面活性剂压裂液在低渗油田的应用现状 总被引:1,自引:0,他引:1
结合粘弹性表面活性剂压裂液作用机理,介绍了3种典型的粘弹性表面活性剂压裂液体系(无聚合物型、抗温型、双子表面活性剂型),并综述了粘弹性表面活性剂压裂液国内外应用现状,指出研制合成工艺简单且成本较低的阴离子双子表面活性剂,开发疏水缔合聚合物/双子表面活性剂压裂液体系,提高抗温性,采用纳米技术是未来压裂液发展趋势。 相似文献
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《分离科学与技术》2012,47(12-13):905-937
Abstract Mathematical models for describing the solubilization of various types of contaminants in micelles of ionic and nonionic surfactants are described. Contaminants which are purely hydrophobic compounds and those which are amphipathic are handled, and electrical effects are described by means of a Debye-Huckel theory approach. It is found that the concentration of contaminant solubilized is a linear function of the total surfactant concentration provided that this is above the critical micelle concentration of the surfactant, in agreement with experimental results. 相似文献